Which of the following terms are correct about polarization – (i) polarization is defined as the average dipole moment per unit volume (ii) Unit of polarization is columb/m2 (iii) Polarization is decreased with increase with frequency
Which following statements are true about an Atom – (i) Electron in the outermost energy level of atom are called valence electrons (ii) Valence electrons of an atom can be removed by heating or by applying electric voltage (iii) Each main shells is divided into sub shells.
Mathematical equation n× p = ni2 = constant is –
According to curie law magnetic susceptibility of a material varies as –
The transition temperature of a superconducting material is 8 K. If the critical magnetic field at 6 K is 8 × 103 A/m. The value of critical field at 0 K is
Consider the following statements: 1) Superconductors exhibit normal conductivity behaviour above a transition temperature Tc 2) Superconductors lose their superconducting nature in an external magnetic field, provided the external magnetic field is above a critical value 3) High Tc superconductors have Tc values in the range 1 to 10 K Which of the above statements are correct?
The chief deterrent to the widespread application of superconducting materials is
Electrical Resistivity p is:
For simple cubic crystal structure, packing efficiency is:
The principle used in the designing of thermocouple is: